Add injections query for markdown

runtime/queries/markdown/injections.scm

@@ -0,0 +1,8 @@
+(fenced_code_block
+  (info_string) @injection.language
+  (code_fence_content) @injection.content)
+
+((html_block) @injection.content
+ (#set! injection.language "html"))
+((html_tag) @injection.content
+ (#set! injection.language "html"))